fix for #785 - fix up gutter logic a little bit. on a path to getting all gutter info in one place

git-svn-id: http://svn.openlayers.org/trunk/openlayers@3555 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Image.js

@@ -172,15 +172,12 @@ OpenLayers.Layer.Image.prototype =
     }, 
 
     /**
-     * Set the tile size based on the map size.  This also sets layer.imageSize
-     * and layer.imageOffset for use by Tile.Image.
+     * Set the tile size based on the map size.
      */
     setTileSize: function() {
         var tileWidth = this.extent.getWidth() / this.map.getResolution();
         var tileHeight = this.extent.getHeight() / this.map.getResolution();
         this.tileSize = new OpenLayers.Size(tileWidth, tileHeight);
-        this.imageSize = this.tileSize;
-        this.imageOffset = new OpenLayers.Pixel(0, 0);
     },
 
     /**